World War I era acquired vessels numbered from SP-500 through
SP-599:
- SP-502: Tasco. 319 gross ton salvage ship, 1907. USN: Tasco, 1917-1919.
- SP-503: Frances II. 16 gross ton motor boat.
USN: Frances II, 1917-1918.
- SP-504: Lowell. 367 gross ton tug, 1909. USN:
Lowell, 1917-1919. No image available
- SP-505: Sea
Tag. 51-foot motor boat, 1917. USN: Sea Tag, 1917-1919
- SP-506: Raccoon. 16 gross ton motor boat, 1915.
USN: Raccoon, 1917-1919.
- SP-507: Machigonne.
140-foot steam yacht, 1909. USN: Machigonne (later renamed
SP-507), 1917-1919
- SP-508: Raazoo.
54-foot motor boat, 1916. Also named Boomerang II. USN:
Raazoo, 1917-1919
- SP-509: Henry
P. Williams. 150-ton steam yacht, 1896. Also named Illawarra.
USN: Oneida, 1898-1915; and Henry P. Williams (later
renamed SP-509), 1917-1918
- SP-510: Suzanne. 123 gross ton motor yacht,
1908. Also named Esperanga and Christine. USN:
Suzanne, 1917-1918.
- SP-511: Alert.
75-foot motor boat, 1913. USN: Alert (later renamed SP-511),
1917-1918
- SP-512: Guinevere. 499 gross ton steam yacht, 1908. USN: Guinevere, 1917-1918.
- SP-516: Actus.
120-foot steam yacht, 1907. Also named Halawa. USN: Actus,
1917-1920
- SP-517: Naushon. 135 gross ton yacht, 1895. Also named Norman and Oneonota. USN: Naushon, 1918-1920
- SP-518: Surf. 398 gross ton steam yacht, 1898.
No U.S. Navy service. No image is available, or known to exist
- SP-519: Vergana. 126 gross ton steam yacht, 1897. USN: Vergana, 1917-1922.
- SP-520: Lu-O-La. Motor boat, 1912. USN: Lu-O-La,
1917-1919. No image available
- SP-521: Isabel. 930-ton yacht. USN: Isabel (later redesignated PY-10), 1917-1946.
- SP-522: Charles
Mann. 79 gross ton tug, 1903. USN: Charles Mann,
1917-1920
- SP-523: Nightingale.
46-foot motor boat. USN: Nightingale, 1917-1919
- SP-524: Margaret.
145-foot steam yacht, 1913. USN: Margaret (later renamed
SP-524), 1917-1920.
- SP-525: Chilhowee. 95 gross ton steam yacht, 1898. USN: Chilhowee, 1917-1919.
- SP-527: Margaret. 245 gross ton yacht, 1899. Also named Eugenia and Marjorie. USN: Margaret, 1917-1921.
- SP-529: Kestrel
II. 93-ton motor yacht, 1912. USN: Kestrel II,
1917-1919
- SP-530: Raymond
J. Anderton. 290 gross ton fishing vessel, 1911. USN:
Raymond J. Anderton, 1917-1919
- SP-531: Margaret.
58 gross ton auxiliary schooner, 1903. Also named Savarona
I. USN: Margaret (later renamed SP-531), 1917-1919.
- SP-533: Paloma.
85-foot motor boat, 1914. USN: Paloma, 1917-1919
- SP-534: Shark.
74-foot 4-inch motor boat, 1909. Also named Ildico IV.
USN: Shark, 1917-1919
- SP-535: Valiant. 19 gross ton auxiliary sailing
vessel, 1896. USN: Valiant, 1917-1918. No image available
- SP-536: Beluga. 73-foot motor boat, 1911. Also named Gaviota. USN: Beluga, 1917-1918
- SP-537: Estella. Motor boat, 1912. USN: Estella,
1917-1920. No image available
- SP-538: Content. 74-foot motor boat, 1912. Also named Dolph II (or Dolf II). USN: Content,
1917-1919.
- SP-539: Euphemia. Motor boat, 1898. USN: Euphemia,
1917-1920.
- SP-540: Bonita. 46-foot motor boat. USN: Bonita, 1917-1918.
- SP-541: Admiral. 73-foot motor boat, 1913.
USN: Admiral, 1917-1919
- SP-542: Etta M. Burns. 40 gross ton auxiliary
schooner, 1902. USN: Etta M. Burns, 1917-1919. No image
available
- SP-543: Sialia.
552 gross ton steam yacht, 1914. USN: Sialia, 1917-1920
- SP-544: Sea
Gull. Motor boat. USN: Sea Gull (later renamed
SP-544), 1917-1918.
- SP-545: Idaho.
23-ton motor boat, 1907. USN: Idaho (later renamed SP-545),
1917-1918
- SP-546: Petrel. Motor boat. USN: Petrel
(later renamed SP-546 and Thrasher), 1917-1919.
No image available
- SP-548: Wachusetts. 65 gross ton fishing vessel. Also named W.T.C.U.. USN: Wachusetts (later renamed SP-548), 1917-1919.
- SP-549: Edorea. 104 gross ton motor yacht, 1909. Also named Monaloa. USN: Edorea, 1917-1918.
- SP-550: Fli Hawk. 35 gross ton motor boat,
1912. USN: Fli Hawk, 1917-1919. No image available
- SP-551: Shad.
43-foot motor boat, 1907. USN: Shad, 1917-1919
- SP-552: Grayling. Motor boat. No U.S. Navy
service. No image available
- SP-556: Cozy. 50-foot motor boat. USN: Cozy, 1917-1918.
- SP-559: Nautilus
II. 66-foot motor boat, 1917. USN: Nautilus II,
1917-1919
- SP-560: Astrea.
35-foot motor boat, 1916. USN: Astrea, 1917-1920
- SP-561: Tamarack. 47 gross ton motor boat,
1915. USN: Tamarack, 1917-1919. No image available
- SP-562: Wild Goose. Motor boat, 1913. USN:
Wild Goose, 1917-1920. No image available
- SP-563: Magnet. 76 gross ton motor boat, 1910.
USN: Magnet, 1917-1920.
- SP-566: Grosbeak. Motor boat, 1916. USN: Grosbeak,
1917-1920. No image available
- SP-567: Mist.
59-foot steam launch, 1904. USN: Mist, 1917-1919
- SP-568: John Sealy. 113 gross ton tug, 1910.
USN: John Sealy, 1917-1917. No image available
- SP-569: Empress. Barge, 1912. USN: Empress,
1917-1917.
- SP-570: Agawam.
40-foot motor boat. USN: Agawam, 1917-1919. Renamed Natick,
1918
- SP-571: Pocomoke. 28 gross ton freight boat.
USN: Pocomoke, 1917-1918. Renamed SP-571, 1918.
No image available
- SP-572: Long
Island. 167-ton steam trawler, 1912. USN: Long Island,
1917-1919
- SP-573: East Hampton. 407 gross ton trawler, 1913. USN: East Hampton, 1917-1920
- SP-575: Cythera. 603 gross ton yacht, 1907. Also named Agawa. USN: Cythera, 1917-1919. Was USS Cythera (PY-26) in 1942
- SP-577: Arcady. 167-ton yacht, 1898. USN: Arcady, 1917-1919
- SP-578: Enaj. 92 gross ton steam boat, 1909.
USN: Enaj, 1917-1918. No image available
- SP-579: Get There. 58' 1½" motor boat, 1916. USN: Get There, 1917-1919
- SP-580: Shada.
96-foot motor boat, 1908. USN: Shada, 1917-1919
- SP-581: Xarifa. 378 gross ton sail and steam yacht, 1896. Also named
Ophelie. USN: Xarifa, 1918-1919
- SP-582: Halcyon.
161 gross ton steam yacht, 1907. Also named Halcyon II.
USN: Halcyon II, 1917-1919. Renamed SP-582, 1918
- SP-583: Vivace. 118-foot steam yacht. USN:
Vivace, 1917-1919
- SP-584: Dreadnought. 32-foot motor boat. USN: Dreadnought, 1917-1919. Renamed SP-584, 1918
- SP-585: Helianthus. 37 gross ton motor boat,
1912. USN: Helianthus, 1917-1919. No image available
- SP-586: Alpha. 56-foot motor boat, 1911. USN: Alpha, 1917-1919
- SP-587: Sayonara
II. 74-foot motor boat, 1916. USN: Sayonara II,
1917-1919
- SP-588: Raeo.
73-foot motor boat, 1908. USN: Raeo, 1917-1919
- SP-590: Aztec. 848 gross ton steam yacht, 1902.
USN: Aztec, 1917-1919
- SP-591: Miramar. 115 gross ton motor boat,
1910. USN: Miramar, 1917-1918
- SP-592: Valeda. 19 gross ton motor boat, 1908.
USN: Valeda, 1917-1920
- SP-593: Artemis. 456 gross ton steam yacht, 1912. Also named Cristina. USN: Artemis, 1917-1919. Renamed Arcturus, 1918
- SP-594: Kuwana II. Motor boat, 1911. USN: Kuwana II, 1917-1918
- SP-596: Pete. 29-foot motor boat. USN: Pete, 1917-1918
- SP-597: Rickwood.
70' 2" motor boat, 1910. Also named Ethel M. Ward.
USN: Rickwood, 1917-1919
- SP-598: Fearless. 15 gross ton motor boat,
1909. USN: Fearless, 1917-1918. Renamed SP-598,
1918
- SP-599: Akbar. 72.5-foot motor boat, 1915. USN: Akbar, 1917-1920
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